Under what conditions does the trp repressor block transcription of the trp operon?
A) when the repressor binds to the inducer
B) when the repressor binds to tryptophan
C) when the repressor is not bound to tryptophan
D) when the repressor is not bound to the operator

Question

Quizplus · Accepted Answer

The trp repressor protein blocks transcription of the trp operon when it binds to tryptophan. This binding changes the shape of the repressor, allowing it to bind to the operator and prevent RNA polymerase from transcribing the genes. When tryptophan is not present in the cell, the repressor is not able to bind to it and transcription occurs.

Under What Conditions Does the Trp Repressor Block Transcription of the Trp